Mechanisms Of Carbon Dioxide Laser Stereolithography

Using a carbon dioxide (CO2) laser focused onto a sample composed of epoxy, diethylene triamine and silica powder, the results showed that we were able to confine the heating in the material and, therefore, curing in all three dimensions. We solved the time-dependent heat equation in cylindrical coordinates using the Crank-Nicholson finite-difference method to predict the curing behavior of the resin as a function of the laser radiation conditions and devised a physical and chemical model that describes the process. The data show the curing rate as a function of temperature. Activation energy results were derived from differential scanning calorimetry.106275281Kaplan, R., (1990) Photonics Spectra, p. 74. , JuneBelfore, D.A., (1993) Laser Focus World, p. 126. , JuneLovins, A.B., Lovins, L.H., (1995) Atlantic Monthly, p. 75. , JanuaryScarparo, M.A.F., Barros, M.L., Kiel, A., Gerck, E., Hurtak, J.J., (1994) J. Appl. Polymer Sci., 54, p. 1575Carslaw, H.S., Jaeger, J.C., (1959) Conduction of Heat in Solids, 10. , 2nd ed. Oxford University, New YorkPress, W.H., Teukolsky, S.A., Vetterling, W.T., Flannery, B.P., (1992) Numerical Recipies in C, pp. 222-259. , Cambridge University PressWisanrakkit, G., Gilham, J.K., The glass transition temperature as a parameter for monitoring the isothermal cure of an amine-cure epoxy system, from polymer characterization: Physical properties, spectroscopic and chromatographic methods (1990) Advances in Chemistry Series, 227. , Eds. C.D. Craver and T. Provder ACS, Washington, DC, ch. 9Willard, P.E., (1972) Polym. Eng. Sci., 12 (2), p. 120Fuller, B., Gotro, J.T., Martin, G.C., Analyses of the glass transition temperature, conversion and viscosity during epoxy resin curing, from polymer characterization: Physical properties and chromatographic methods (1990) Advances in Chemistry Series, 277. , Eds. C.D. Craver and T. Provder ACS, Washington, DC, ch. 1